Thickness dependent adhesion force and its correlation to surface roughness in multilayered graphene

Pourzand, Hoorad; Pai, Pradeep; Tabib-Azar, Massood

doi:10.1109/icsens.2013.6688415

Cited by 3 publications

(3 citation statements)

References 12 publications

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“…which represents the in‐fluid measurements of the adhesion force) has shown an influence of silicon surface on the adhesion measurements of these flakes. Our results are consistent with previous work of measuring the in‐air adhesion (Pourzand et al ., ) in terms of the effect of both the silicon substrate and the graphene thickness on the adhesion measurements. We report an increase in the adhesion force with the decreasing thickness of multi‐layered graphene flakes as shown in our data (Fig.…”

Section: Discussionmentioning

confidence: 99%

Adhesive force between graphene nanoscale flakes and living biological cells

Faouri

Henry

Biris

et al. 2017

J of Applied Toxicology

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We report on a measurement technique that quantifies the adhesive force between multi-layers of graphene flakes and the cell wall of live Escherichia coli cells using atomic force microscopy (AFM) in-fluid Peak Force-Quantitative Nanomechanical Mapping mode. To measure the adhesive force, we made use of the negative charge of E. coli cells to allow them to stick to positively charged surfaces, such as glass or silicon, that were covered by poly-L-Lysine. With this approach, cells were held in place for AFM characterization. Both pristine graphene (PG) flakes and functionalized graphene (FG) flakes were put on the E. coli cells and measurements of lateral size, flake thickness, and adhesion were made. Using this approach, the measured values of the adhesive force between multi-layers of graphene flakes (total thickness of 50 nm) and E. coli was determined to be equal or greater than 431 AE 65pN for (PG) and 694 AE 98pN for the (FG). More interestingly, the adhesive force of a graphene flake (thickness 1.3 nm) with the cell is determined to be equal or greater than 38.2 AE 16.4pN for the (PG) and 34.8 AE 15.3pN for the (FG). These interaction values can play an important role in determining and understanding the possible toxicity of graphene flakes.

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Section: Discussionmentioning

confidence: 99%

Adhesive force between graphene nanoscale flakes and living biological cells

Faouri

Henry

Biris

et al. 2017

J of Applied Toxicology

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“…When we simulate the relationship between the number of layers and friction, the load is also constant. According to the literature (Pourzand et al, 2013), the interlayer adhesion decreases with increasing layer thickness (number of layers). That is, as the number of layers of the slider increases, the adhesion between the slider and the substrate decreases, resulting in a decrease in friction, as shown in Figure 11.…”

Section: Effect Of the Number Of Slider Layers On Frictionmentioning

confidence: 97%

Interlayer Friction in Graphene/MoS2, Graphene/NbSe2, Tellurene/MoS2 and Tellurene/NbSe2 van der Waals Heterostructures

Wei

et al. 2022

Front. Mech. Eng.

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Two-dimensional (2D) materials have a wide range of applications in the field of molecular-level solid lubrication due to their ultrahigh mechanical strength and extremely low friction properties at the nanoscale. In this work, we investigated the interlayer friction properties of four different heterostructures, namely, graphene/MoS2, graphene/NbSe2, α-tellurene/MoS2 and α-tellurene/NbSe2, using a molecular dynamics (MD) method. The effects of a series of influencing factors on the interlayer friction were investigated. The results show that for the four heterostructures, the influence laws of layer number, temperature, and normal load on interlayer friction show consistency. The twist angle can effectively regulate the interlayer friction of these 2D materials, but the superlubricity phenomenon cannot occur for α-Te/MoS2 and α-Te/NbSe2 systems. Furthermore, we address the origin of friction in detail, emphasizing the contribution of edge pinning and interface sliding resistance to the frictional force of the heterostructure. The friction decreases with increasing temperature and sliding speed due to the reduction in the interlayer adhesion force. The present findings provide a deep understanding of friction control and contribute much to the design of robust 2D superlubricity systems.

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“…CVD grown). The effect of the substrate roughness on the adhesion force of graphene was studied by Pourzand et al [60] . They observed that the tip-radius scale roughness can double the adhesion force compared to a flat surface and concluded that the surface roughness significantly affects the adhesion force.…”

Section: T1mentioning

confidence: 99%

Fundamental Study of Nano-Scale Adhesion and Friction Properties of Graphene in Ambient Air and Liquid Environments

Ramayanam¹

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The aim of this study is to understand the fundamental tribological interactions of model contacts developed between a 'single' asperity silicon tip and a few layer graphene surface in ambient air, ionic liquid, and lubricating oil environments. The motivation to investigate such fundamental interactions stems from the need to gain an understanding of the tribological properties, morphology and defects of few layer graphene with respect to different synthesis methods including both bottom-up and top-down approaches. In particular, the surface properties of atomically thin sheets of graphene synthesized by three methods; (i) liquid phase exfoliation of graphene, (ii) chemical reduction of exfoliated graphene oxide, on a silicon oxide substrate, and (iii) graphene synthesis by halogen based plasma etching on a silicon carbide substrate are studied using atomic force microscopy, lateral force microscopy and x-ray photoelectron spectroscopy. Friction of Si 'single' asperities sliding against a few layer graphene surface in ambient air, ionic liquid, and lubricating oil environments is reported. It is found that oxygen based defects play a major role in controlling the friction and adhesion properties of few layer graphene surfaces. The role of substrate and its bonding with the few layer graphene is also an important parameter. In liquids, we report a newly observed Stribeck like behavior in the nanoscale. This work can lead to important device applications with reduced friction such as contact-based microelectromechanical systems. It also sheds light on liquid-graphene interfacial characteristics which can be proved vital in applications spanning from electrochemical energy devices to nanolubricants.

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Thickness dependent adhesion force and its correlation to surface roughness in multilayered graphene

Cited by 3 publications

References 12 publications

Adhesive force between graphene nanoscale flakes and living biological cells

Adhesive force between graphene nanoscale flakes and living biological cells

Interlayer Friction in Graphene/MoS2, Graphene/NbSe2, Tellurene/MoS2 and Tellurene/NbSe2 van der Waals Heterostructures

Fundamental Study of Nano-Scale Adhesion and Friction Properties of Graphene in Ambient Air and Liquid Environments

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